d.ts files (see later sections).Īdditionally, there is special inference for the following: NextItem // now we know nextItem is a stringįor a function, the return type can be inferred from the return statements.įor function parameters, there is currently no inference, but there are ways to work around this using JSDoc or TypeScript. NextItem // here we know nextItem is a number Luckily, it is usually fairly easy to figure out a type given the surrounding code context.įor a variable or property, the type is typically the type of the value used to initialize it or the most recent value assignment. In JavaScript, most of the time there is no explicit type information available.
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